Windows only: Windows Search 4.0, an updated version of the desktop/web search tool that was introduced with Vista, is now officially available for Windows XP and Vista through Windows Update. As was the case with the technical preview, Windows Search 4.0 boasts faster and deeper indexing, better handling of email cataloging, support for encrypted documents, and a new system tray interface. Windows Search 4.0 is free and being rolled out gradually, but you can grab it manually from a link at this page.